diff options
Diffstat (limited to 'vorbis/lib/vorbisfile.c')
| -rw-r--r-- | vorbis/lib/vorbisfile.c | 2424 |
1 files changed, 0 insertions, 2424 deletions
diff --git a/vorbis/lib/vorbisfile.c b/vorbis/lib/vorbisfile.c deleted file mode 100644 index b570c3c..0000000 --- a/vorbis/lib/vorbisfile.c +++ /dev/null @@ -1,2424 +0,0 @@ -/******************************************************************** - * * - * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * - * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * - * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * - * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * - * * - * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2015 * - * by the Xiph.Org Foundation http://www.xiph.org/ * - * * - ******************************************************************** - - function: stdio-based convenience library for opening/seeking/decoding - - ********************************************************************/ - -#include <stdlib.h> -#include <stdio.h> -#include <errno.h> -#include <string.h> -#include <math.h> - -#include "vorbis/codec.h" - -/* we don't need or want the static callback symbols here */ -#define OV_EXCLUDE_STATIC_CALLBACKS -#include "vorbis/vorbisfile.h" - -#include "os.h" -#include "misc.h" - -/* A 'chained bitstream' is a Vorbis bitstream that contains more than - one logical bitstream arranged end to end (the only form of Ogg - multiplexing allowed in a Vorbis bitstream; grouping [parallel - multiplexing] is not allowed in Vorbis) */ - -/* A Vorbis file can be played beginning to end (streamed) without - worrying ahead of time about chaining (see decoder_example.c). If - we have the whole file, however, and want random access - (seeking/scrubbing) or desire to know the total length/time of a - file, we need to account for the possibility of chaining. */ - -/* We can handle things a number of ways; we can determine the entire - bitstream structure right off the bat, or find pieces on demand. - This example determines and caches structure for the entire - bitstream, but builds a virtual decoder on the fly when moving - between links in the chain. */ - -/* There are also different ways to implement seeking. Enough - information exists in an Ogg bitstream to seek to - sample-granularity positions in the output. Or, one can seek by - picking some portion of the stream roughly in the desired area if - we only want coarse navigation through the stream. */ - -/************************************************************************* - * Many, many internal helpers. The intention is not to be confusing; - * rampant duplication and monolithic function implementation would be - * harder to understand anyway. The high level functions are last. Begin - * grokking near the end of the file */ - -/* read a little more data from the file/pipe into the ogg_sync framer -*/ -#define CHUNKSIZE 65536 /* greater-than-page-size granularity seeking */ -#define READSIZE 2048 /* a smaller read size is needed for low-rate streaming. */ - -static long _get_data(OggVorbis_File *vf){ - errno=0; - if(!(vf->callbacks.read_func))return(-1); - if(vf->datasource){ - char *buffer=ogg_sync_buffer(&vf->oy,READSIZE); - long bytes=(vf->callbacks.read_func)(buffer,1,READSIZE,vf->datasource); - if(bytes>0)ogg_sync_wrote(&vf->oy,bytes); - if(bytes==0 && errno)return(-1); - return(bytes); - }else - return(0); -} - -/* save a tiny smidge of verbosity to make the code more readable */ -static int _seek_helper(OggVorbis_File *vf,ogg_int64_t offset){ - if(vf->datasource){ - /* only seek if the file position isn't already there */ - if(vf->offset != offset){ - if(!(vf->callbacks.seek_func)|| - (vf->callbacks.seek_func)(vf->datasource, offset, SEEK_SET) == -1) - return OV_EREAD; - vf->offset=offset; - ogg_sync_reset(&vf->oy); - } - }else{ - /* shouldn't happen unless someone writes a broken callback */ - return OV_EFAULT; - } - return 0; -} - -/* The read/seek functions track absolute position within the stream */ - -/* from the head of the stream, get the next page. boundary specifies - if the function is allowed to fetch more data from the stream (and - how much) or only use internally buffered data. - - boundary: -1) unbounded search - 0) read no additional data; use cached only - n) search for a new page beginning for n bytes - - return: <0) did not find a page (OV_FALSE, OV_EOF, OV_EREAD) - n) found a page at absolute offset n */ - -static ogg_int64_t _get_next_page(OggVorbis_File *vf,ogg_page *og, - ogg_int64_t boundary){ - if(boundary>0)boundary+=vf->offset; - while(1){ - long more; - - if(boundary>0 && vf->offset>=boundary)return(OV_FALSE); - more=ogg_sync_pageseek(&vf->oy,og); - - if(more<0){ - /* skipped n bytes */ - vf->offset-=more; - }else{ - if(more==0){ - /* send more paramedics */ - if(!boundary)return(OV_FALSE); - { - long ret=_get_data(vf); - if(ret==0)return(OV_EOF); - if(ret<0)return(OV_EREAD); - } - }else{ - /* got a page. Return the offset at the page beginning, - advance the internal offset past the page end */ - ogg_int64_t ret=vf->offset; - vf->offset+=more; - return(ret); - - } - } - } -} - -/* find the latest page beginning before the passed in position. Much - dirtier than the above as Ogg doesn't have any backward search - linkage. no 'readp' as it will certainly have to read. */ -/* returns offset or OV_EREAD, OV_FAULT */ -static ogg_int64_t _get_prev_page(OggVorbis_File *vf,ogg_int64_t begin,ogg_page *og){ - ogg_int64_t end = begin; - ogg_int64_t ret; - ogg_int64_t offset=-1; - - while(offset==-1){ - begin-=CHUNKSIZE; - if(begin<0) - begin=0; - - ret=_seek_helper(vf,begin); - if(ret)return(ret); - - while(vf->offset<end){ - memset(og,0,sizeof(*og)); - ret=_get_next_page(vf,og,end-vf->offset); - if(ret==OV_EREAD)return(OV_EREAD); - if(ret<0){ - break; - }else{ - offset=ret; - } - } - } - - /* In a fully compliant, non-multiplexed stream, we'll still be - holding the last page. In multiplexed (or noncompliant streams), - we will probably have to re-read the last page we saw */ - if(og->header_len==0){ - ret=_seek_helper(vf,offset); - if(ret)return(ret); - - ret=_get_next_page(vf,og,CHUNKSIZE); - if(ret<0) - /* this shouldn't be possible */ - return(OV_EFAULT); - } - - return(offset); -} - -static void _add_serialno(ogg_page *og,long **serialno_list, int *n){ - long s = ogg_page_serialno(og); - (*n)++; - - if(*serialno_list){ - *serialno_list = _ogg_realloc(*serialno_list, sizeof(**serialno_list)*(*n)); - }else{ - *serialno_list = _ogg_malloc(sizeof(**serialno_list)); - } - - (*serialno_list)[(*n)-1] = s; -} - -/* returns nonzero if found */ -static int _lookup_serialno(long s, long *serialno_list, int n){ - if(serialno_list){ - while(n--){ - if(*serialno_list == s) return 1; - serialno_list++; - } - } - return 0; -} - -static int _lookup_page_serialno(ogg_page *og, long *serialno_list, int n){ - long s = ogg_page_serialno(og); - return _lookup_serialno(s,serialno_list,n); -} - -/* performs the same search as _get_prev_page, but prefers pages of - the specified serial number. If a page of the specified serialno is - spotted during the seek-back-and-read-forward, it will return the - info of last page of the matching serial number instead of the very - last page. If no page of the specified serialno is seen, it will - return the info of last page and alter *serialno. */ -static ogg_int64_t _get_prev_page_serial(OggVorbis_File *vf, ogg_int64_t begin, - long *serial_list, int serial_n, - int *serialno, ogg_int64_t *granpos){ - ogg_page og; - ogg_int64_t end=begin; - ogg_int64_t ret; - - ogg_int64_t prefoffset=-1; - ogg_int64_t offset=-1; - ogg_int64_t ret_serialno=-1; - ogg_int64_t ret_gran=-1; - - while(offset==-1){ - begin-=CHUNKSIZE; - if(begin<0) - begin=0; - - ret=_seek_helper(vf,begin); - if(ret)return(ret); - - while(vf->offset<end){ - ret=_get_next_page(vf,&og,end-vf->offset); - if(ret==OV_EREAD)return(OV_EREAD); - if(ret<0){ - break; - }else{ - ret_serialno=ogg_page_serialno(&og); - ret_gran=ogg_page_granulepos(&og); - offset=ret; - - if(ret_serialno == *serialno){ - prefoffset=ret; - *granpos=ret_gran; - } - - if(!_lookup_serialno(ret_serialno,serial_list,serial_n)){ - /* we fell off the end of the link, which means we seeked - back too far and shouldn't have been looking in that link - to begin with. If we found the preferred serial number, - forget that we saw it. */ - prefoffset=-1; - } - } - } - } - - /* we're not interested in the page... just the serialno and granpos. */ - if(prefoffset>=0)return(prefoffset); - - *serialno = ret_serialno; - *granpos = ret_gran; - return(offset); - -} - -/* uses the local ogg_stream storage in vf; this is important for - non-streaming input sources */ -static int _fetch_headers(OggVorbis_File *vf,vorbis_info *vi,vorbis_comment *vc, - long **serialno_list, int *serialno_n, - ogg_page *og_ptr){ - ogg_page og; - ogg_packet op; - int i,ret; - int allbos=0; - - if(!og_ptr){ - ogg_int64_t llret=_get_next_page(vf,&og,CHUNKSIZE); - if(llret==OV_EREAD)return(OV_EREAD); - if(llret<0)return(OV_ENOTVORBIS); - og_ptr=&og; - } - - vorbis_info_init(vi); - vorbis_comment_init(vc); - vf->ready_state=OPENED; - - /* extract the serialnos of all BOS pages + the first set of vorbis - headers we see in the link */ - - while(ogg_page_bos(og_ptr)){ - if(serialno_list){ - if(_lookup_page_serialno(og_ptr,*serialno_list,*serialno_n)){ - /* a dupe serialnumber in an initial header packet set == invalid stream */ - if(*serialno_list)_ogg_free(*serialno_list); - *serialno_list=0; - *serialno_n=0; - ret=OV_EBADHEADER; - goto bail_header; - } - - _add_serialno(og_ptr,serialno_list,serialno_n); - } - - if(vf->ready_state<STREAMSET){ - /* we don't have a vorbis stream in this link yet, so begin - prospective stream setup. We need a stream to get packets */ - ogg_stream_reset_serialno(&vf->os,ogg_page_serialno(og_ptr)); - ogg_stream_pagein(&vf->os,og_ptr); - - if(ogg_stream_packetout(&vf->os,&op) > 0 && - vorbis_synthesis_idheader(&op)){ - /* vorbis header; continue setup */ - vf->ready_state=STREAMSET; - if((ret=vorbis_synthesis_headerin(vi,vc,&op))){ - ret=OV_EBADHEADER; - goto bail_header; - } - } - } - - /* get next page */ - { - ogg_int64_t llret=_get_next_page(vf,og_ptr,CHUNKSIZE); - if(llret==OV_EREAD){ - ret=OV_EREAD; - goto bail_header; - } - if(llret<0){ - ret=OV_ENOTVORBIS; - goto bail_header; - } - - /* if this page also belongs to our vorbis stream, submit it and break */ - if(vf->ready_state==STREAMSET && - vf->os.serialno == ogg_page_serialno(og_ptr)){ - ogg_stream_pagein(&vf->os,og_ptr); - break; - } - } - } - - if(vf->ready_state!=STREAMSET){ - ret = OV_ENOTVORBIS; - goto bail_header; - } - - while(1){ - - i=0; - while(i<2){ /* get a page loop */ - - while(i<2){ /* get a packet loop */ - - int result=ogg_stream_packetout(&vf->os,&op); - if(result==0)break; - if(result==-1){ - ret=OV_EBADHEADER; - goto bail_header; - } - - if((ret=vorbis_synthesis_headerin(vi,vc,&op))) - goto bail_header; - - i++; - } - - while(i<2){ - if(_get_next_page(vf,og_ptr,CHUNKSIZE)<0){ - ret=OV_EBADHEADER; - goto bail_header; - } - - /* if this page belongs to the correct stream, go parse it */ - if(vf->os.serialno == ogg_page_serialno(og_ptr)){ - ogg_stream_pagein(&vf->os,og_ptr); - break; - } - - /* if we never see the final vorbis headers before the link - ends, abort */ - if(ogg_page_bos(og_ptr)){ - if(allbos){ - ret = OV_EBADHEADER; - goto bail_header; - }else - allbos=1; - } - - /* otherwise, keep looking */ - } - } - - return 0; - } - - bail_header: - vorbis_info_clear(vi); - vorbis_comment_clear(vc); - vf->ready_state=OPENED; - - return ret; -} - -/* Starting from current cursor position, get initial PCM offset of - next page. Consumes the page in the process without decoding - audio, however this is only called during stream parsing upon - seekable open. */ -static ogg_int64_t _initial_pcmoffset(OggVorbis_File *vf, vorbis_info *vi){ - ogg_page og; - ogg_int64_t accumulated=0; - long lastblock=-1; - int result; - int serialno = vf->os.serialno; - - while(1){ - ogg_packet op; - if(_get_next_page(vf,&og,-1)<0) - break; /* should not be possible unless the file is truncated/mangled */ - - if(ogg_page_bos(&og)) break; - if(ogg_page_serialno(&og)!=serialno) continue; - - /* count blocksizes of all frames in the page */ - ogg_stream_pagein(&vf->os,&og); - while((result=ogg_stream_packetout(&vf->os,&op))){ - if(result>0){ /* ignore holes */ - long thisblock=vorbis_packet_blocksize(vi,&op); - if(thisblock>=0){ - if(lastblock!=-1) - accumulated+=(lastblock+thisblock)>>2; - lastblock=thisblock; - } - } - } - - if(ogg_page_granulepos(&og)!=-1){ - /* pcm offset of last packet on the first audio page */ - accumulated= ogg_page_granulepos(&og)-accumulated; - break; - } - } - - /* less than zero? Either a corrupt file or a stream with samples - trimmed off the beginning, a normal occurrence; in both cases set - the offset to zero */ - if(accumulated<0)accumulated=0; - - return accumulated; -} - -/* finds each bitstream link one at a time using a bisection search - (has to begin by knowing the offset of the lb's initial page). - Recurses for each link so it can alloc the link storage after - finding them all, then unroll and fill the cache at the same time */ -static int _bisect_forward_serialno(OggVorbis_File *vf, - ogg_int64_t begin, - ogg_int64_t searched, - ogg_int64_t end, - ogg_int64_t endgran, - int endserial, - long *currentno_list, - int currentnos, - long m){ - ogg_int64_t pcmoffset; - ogg_int64_t dataoffset=searched; - ogg_int64_t endsearched=end; - ogg_int64_t next=end; - ogg_int64_t searchgran=-1; - ogg_page og; - ogg_int64_t ret,last; - int serialno = vf->os.serialno; - - /* invariants: - we have the headers and serialnos for the link beginning at 'begin' - we have the offset and granpos of the last page in the file (potentially - not a page we care about) - */ - - /* Is the last page in our list of current serialnumbers? */ - if(_lookup_serialno(endserial,currentno_list,currentnos)){ - - /* last page is in the starting serialno list, so we've bisected - down to (or just started with) a single link. Now we need to - find the last vorbis page belonging to the first vorbis stream - for this link. */ - searched = end; - while(endserial != serialno){ - endserial = serialno; - searched=_get_prev_page_serial(vf,searched,currentno_list,currentnos,&endserial,&endgran); - } - - vf->links=m+1; - if(vf->offsets)_ogg_free(vf->offsets); - if(vf->serialnos)_ogg_free(vf->serialnos); - if(vf->dataoffsets)_ogg_free(vf->dataoffsets); - - vf->offsets=_ogg_malloc((vf->links+1)*sizeof(*vf->offsets)); - vf->vi=_ogg_realloc(vf->vi,vf->links*sizeof(*vf->vi)); - vf->vc=_ogg_realloc(vf->vc,vf->links*sizeof(*vf->vc)); - vf->serialnos=_ogg_malloc(vf->links*sizeof(*vf->serialnos)); - vf->dataoffsets=_ogg_malloc(vf->links*sizeof(*vf->dataoffsets)); - vf->pcmlengths=_ogg_malloc(vf->links*2*sizeof(*vf->pcmlengths)); - - vf->offsets[m+1]=end; - vf->offsets[m]=begin; - vf->pcmlengths[m*2+1]=(endgran<0?0:endgran); - - }else{ - - /* last page is not in the starting stream's serial number list, - so we have multiple links. Find where the stream that begins - our bisection ends. */ - - long *next_serialno_list=NULL; - int next_serialnos=0; - vorbis_info vi; - vorbis_comment vc; - int testserial = serialno+1; - - /* the below guards against garbage seperating the last and - first pages of two links. */ - while(searched<endsearched){ - ogg_int64_t bisect; - - if(endsearched-searched<CHUNKSIZE){ - bisect=searched; - }else{ - bisect=(searched+endsearched)/2; - } - - ret=_seek_helper(vf,bisect); - if(ret)return(ret); - - last=_get_next_page(vf,&og,-1); - if(last==OV_EREAD)return(OV_EREAD); - if(last<0 || !_lookup_page_serialno(&og,currentno_list,currentnos)){ - endsearched=bisect; - if(last>=0)next=last; - }else{ - searched=vf->offset; - } - } - - /* Bisection point found */ - /* for the time being, fetch end PCM offset the simple way */ - searched = next; - while(testserial != serialno){ - testserial = serialno; - searched = _get_prev_page_serial(vf,searched,currentno_list,currentnos,&testserial,&searchgran); - } - - ret=_seek_helper(vf,next); - if(ret)return(ret); - - ret=_fetch_headers(vf,&vi,&vc,&next_serialno_list,&next_serialnos,NULL); - if(ret)return(ret); - serialno = vf->os.serialno; - dataoffset = vf->offset; - - /* this will consume a page, however the next bisection always - starts with a raw seek */ - pcmoffset = _initial_pcmoffset(vf,&vi); - - ret=_bisect_forward_serialno(vf,next,vf->offset,end,endgran,endserial, - next_serialno_list,next_serialnos,m+1); - if(ret)return(ret); - - if(next_serialno_list)_ogg_free(next_serialno_list); - - vf->offsets[m+1]=next; - vf->serialnos[m+1]=serialno; - vf->dataoffsets[m+1]=dataoffset; - - vf->vi[m+1]=vi; - vf->vc[m+1]=vc; - - vf->pcmlengths[m*2+1]=searchgran; - vf->pcmlengths[m*2+2]=pcmoffset; - vf->pcmlengths[m*2+3]-=pcmoffset; - if(vf->pcmlengths[m*2+3]<0)vf->pcmlengths[m*2+3]=0; - } - return(0); -} - -static int _make_decode_ready(OggVorbis_File *vf){ - if(vf->ready_state>STREAMSET)return 0; - if(vf->ready_state<STREAMSET)return OV_EFAULT; - if(vf->seekable){ - if(vorbis_synthesis_init(&vf->vd,vf->vi+vf->current_link)) - return OV_EBADLINK; - }else{ - if(vorbis_synthesis_init(&vf->vd,vf->vi)) - return OV_EBADLINK; - } - vorbis_block_init(&vf->vd,&vf->vb); - vf->ready_state=INITSET; - vf->bittrack=0.f; - vf->samptrack=0.f; - return 0; -} - -static int _open_seekable2(OggVorbis_File *vf){ - ogg_int64_t dataoffset=vf->dataoffsets[0],end,endgran=-1; - int endserial=vf->os.serialno; - int serialno=vf->os.serialno; - - /* we're partially open and have a first link header state in - storage in vf */ - - /* fetch initial PCM offset */ - ogg_int64_t pcmoffset = _initial_pcmoffset(vf,vf->vi); - - /* we can seek, so set out learning all about this file */ - if(vf->callbacks.seek_func && vf->callbacks.tell_func){ - (vf->callbacks.seek_func)(vf->datasource,0,SEEK_END); - vf->offset=vf->end=(vf->callbacks.tell_func)(vf->datasource); - }else{ - vf->offset=vf->end=-1; - } - - /* If seek_func is implemented, tell_func must also be implemented */ - if(vf->end==-1) return(OV_EINVAL); - - /* Get the offset of the last page of the physical bitstream, or, if - we're lucky the last vorbis page of this link as most OggVorbis - files will contain a single logical bitstream */ - end=_get_prev_page_serial(vf,vf->end,vf->serialnos+2,vf->serialnos[1],&endserial,&endgran); - if(end<0)return(end); - - /* now determine bitstream structure recursively */ - if(_bisect_forward_serialno(vf,0,dataoffset,end,endgran,endserial, - vf->serialnos+2,vf->serialnos[1],0)<0)return(OV_EREAD); - - vf->offsets[0]=0; - vf->serialnos[0]=serialno; - vf->dataoffsets[0]=dataoffset; - vf->pcmlengths[0]=pcmoffset; - vf->pcmlengths[1]-=pcmoffset; - if(vf->pcmlengths[1]<0)vf->pcmlengths[1]=0; - - return(ov_raw_seek(vf,dataoffset)); -} - -/* clear out the current logical bitstream decoder */ -static void _decode_clear(OggVorbis_File *vf){ - vorbis_dsp_clear(&vf->vd); - vorbis_block_clear(&vf->vb); - vf->ready_state=OPENED; -} - -/* fetch and process a packet. Handles the case where we're at a - bitstream boundary and dumps the decoding machine. If the decoding - machine is unloaded, it loads it. It also keeps pcm_offset up to - date (seek and read both use this. seek uses a special hack with - readp). - - return: <0) error, OV_HOLE (lost packet) or OV_EOF - 0) need more data (only if readp==0) - 1) got a packet -*/ - -static int _fetch_and_process_packet(OggVorbis_File *vf, - ogg_packet *op_in, - int readp, - int spanp){ - ogg_page og; - - /* handle one packet. Try to fetch it from current stream state */ - /* extract packets from page */ - while(1){ - - if(vf->ready_state==STREAMSET){ - int ret=_make_decode_ready(vf); - if(ret<0)return ret; - } - - /* process a packet if we can. */ - - if(vf->ready_state==INITSET){ - int hs=vorbis_synthesis_halfrate_p(vf->vi); - - while(1) { - ogg_packet op; - ogg_packet *op_ptr=(op_in?op_in:&op); - int result=ogg_stream_packetout(&vf->os,op_ptr); - ogg_int64_t granulepos; - - op_in=NULL; - if(result==-1)return(OV_HOLE); /* hole in the data. */ - if(result>0){ - /* got a packet. process it */ - granulepos=op_ptr->granulepos; - if(!vorbis_synthesis(&vf->vb,op_ptr)){ /* lazy check for lazy - header handling. The - header packets aren't - audio, so if/when we - submit them, - vorbis_synthesis will - reject them */ - - /* suck in the synthesis data and track bitrate */ - { - int oldsamples=vorbis_synthesis_pcmout(&vf->vd,NULL); - /* for proper use of libvorbis within libvorbisfile, - oldsamples will always be zero. */ - if(oldsamples)return(OV_EFAULT); - - vorbis_synthesis_blockin(&vf->vd,&vf->vb); - vf->samptrack+=(vorbis_synthesis_pcmout(&vf->vd,NULL)<<hs); - vf->bittrack+=op_ptr->bytes*8; - } - - /* update the pcm offset. */ - if(granulepos!=-1 && !op_ptr->e_o_s){ - int link=(vf->seekable?vf->current_link:0); - int i,samples; - - /* this packet has a pcm_offset on it (the last packet - completed on a page carries the offset) After processing - (above), we know the pcm position of the *last* sample - ready to be returned. Find the offset of the *first* - - As an aside, this trick is inaccurate if we begin - reading anew right at the last page; the end-of-stream - granulepos declares the last frame in the stream, and the - last packet of the last page may be a partial frame. - So, we need a previous granulepos from an in-sequence page - to have a reference point. Thus the !op_ptr->e_o_s clause - above */ - - if(vf->seekable && link>0) - granulepos-=vf->pcmlengths[link*2]; - if(granulepos<0)granulepos=0; /* actually, this - shouldn't be possible - here unless the stream - is very broken */ - - samples=(vorbis_synthesis_pcmout(&vf->vd,NULL)<<hs); - - granulepos-=samples; - for(i=0;i<link;i++) - granulepos+=vf->pcmlengths[i*2+1]; - vf->pcm_offset=granulepos; - } - return(1); - } - } - else - break; - } - } - - if(vf->ready_state>=OPENED){ - ogg_int64_t ret; - - while(1){ - /* the loop is not strictly necessary, but there's no sense in - doing the extra checks of the larger loop for the common - case in a multiplexed bistream where the page is simply - part of a different logical bitstream; keep reading until - we get one with the correct serialno */ - - if(!readp)return(0); - if((ret=_get_next_page(vf,&og,-1))<0){ - return(OV_EOF); /* eof. leave unitialized */ - } - - /* bitrate tracking; add the header's bytes here, the body bytes - are done by packet above */ - vf->bittrack+=og.header_len*8; - - if(vf->ready_state==INITSET){ - if(vf->current_serialno!=ogg_page_serialno(&og)){ - - /* two possibilities: - 1) our decoding just traversed a bitstream boundary - 2) another stream is multiplexed into this logical section */ - - if(ogg_page_bos(&og)){ - /* boundary case */ - if(!spanp) - return(OV_EOF); - - _decode_clear(vf); - - if(!vf->seekable){ - vorbis_info_clear(vf->vi); - vorbis_comment_clear(vf->vc); - } - break; - - }else - continue; /* possibility #2 */ - } - } - - break; - } - } - - /* Do we need to load a new machine before submitting the page? */ - /* This is different in the seekable and non-seekable cases. - - In the seekable case, we already have all the header - information loaded and cached; we just initialize the machine - with it and continue on our merry way. - - In the non-seekable (streaming) case, we'll only be at a - boundary if we just left the previous logical bitstream and - we're now nominally at the header of the next bitstream - */ - - if(vf->ready_state!=INITSET){ - int link; - - if(vf->ready_state<STREAMSET){ - if(vf->seekable){ - long serialno = ogg_page_serialno(&og); - - /* match the serialno to bitstream section. We use this rather than - offset positions to avoid problems near logical bitstream - boundaries */ - - for(link=0;link<vf->links;link++) - if(vf->serialnos[link]==serialno)break; - - if(link==vf->links) continue; /* not the desired Vorbis - bitstream section; keep - trying */ - - vf->current_serialno=serialno; - vf->current_link=link; - - ogg_stream_reset_serialno(&vf->os,vf->current_serialno); - vf->ready_state=STREAMSET; - - }else{ - /* we're streaming */ - /* fetch the three header packets, build the info struct */ - - int ret=_fetch_headers(vf,vf->vi,vf->vc,NULL,NULL,&og); - if(ret)return(ret); - vf->current_serialno=vf->os.serialno; - vf->current_link++; - link=0; - } - } - } - - /* the buffered page is the data we want, and we're ready for it; - add it to the stream state */ - ogg_stream_pagein(&vf->os,&og); - - } -} - -/* if, eg, 64 bit stdio is configured by default, this will build with - fseek64 */ -static int _fseek64_wrap(FILE *f,ogg_int64_t off,int whence){ - if(f==NULL)return(-1); - return fseek(f,off,whence); -} - -static int _ov_open1(void *f,OggVorbis_File *vf,const char *initial, - long ibytes, ov_callbacks callbacks){ - int offsettest=((f && callbacks.seek_func)?callbacks.seek_func(f,0,SEEK_CUR):-1); - long *serialno_list=NULL; - int serialno_list_size=0; - int ret; - - memset(vf,0,sizeof(*vf)); - vf->datasource=f; - vf->callbacks = callbacks; - - /* init the framing state */ - ogg_sync_init(&vf->oy); - - /* perhaps some data was previously read into a buffer for testing - against other stream types. Allow initialization from this - previously read data (especially as we may be reading from a - non-seekable stream) */ - if(initial){ - char *buffer=ogg_sync_buffer(&vf->oy,ibytes); - memcpy(buffer,initial,ibytes); - ogg_sync_wrote(&vf->oy,ibytes); - } - - /* can we seek? Stevens suggests the seek test was portable */ - if(offsettest!=-1)vf->seekable=1; - - /* No seeking yet; Set up a 'single' (current) logical bitstream - entry for partial open */ - vf->links=1; - vf->vi=_ogg_calloc(vf->links,sizeof(*vf->vi)); - vf->vc=_ogg_calloc(vf->links,sizeof(*vf->vc)); - ogg_stream_init(&vf->os,-1); /* fill in the serialno later */ - - /* Fetch all BOS pages, store the vorbis header and all seen serial - numbers, load subsequent vorbis setup headers */ - if((ret=_fetch_headers(vf,vf->vi,vf->vc,&serialno_list,&serialno_list_size,NULL))<0){ - vf->datasource=NULL; - ov_clear(vf); - }else{ - /* serial number list for first link needs to be held somewhere - for second stage of seekable stream open; this saves having to - seek/reread first link's serialnumber data then. */ - vf->serialnos=_ogg_calloc(serialno_list_size+2,sizeof(*vf->serialnos)); - vf->serialnos[0]=vf->current_serialno=vf->os.serialno; - vf->serialnos[1]=serialno_list_size; - memcpy(vf->serialnos+2,serialno_list,serialno_list_size*sizeof(*vf->serialnos)); - - vf->offsets=_ogg_calloc(1,sizeof(*vf->offsets)); - vf->dataoffsets=_ogg_calloc(1,sizeof(*vf->dataoffsets)); - vf->offsets[0]=0; - vf->dataoffsets[0]=vf->offset; - - vf->ready_state=PARTOPEN; - } - if(serialno_list)_ogg_free(serialno_list); - return(ret); -} - -static int _ov_open2(OggVorbis_File *vf){ - if(vf->ready_state != PARTOPEN) return OV_EINVAL; - vf->ready_state=OPENED; - if(vf->seekable){ - int ret=_open_seekable2(vf); - if(ret){ - vf->datasource=NULL; - ov_clear(vf); - } - return(ret); - }else - vf->ready_state=STREAMSET; - - return 0; -} - - -/* clear out the OggVorbis_File struct */ -int ov_clear(OggVorbis_File *vf){ - if(vf){ - vorbis_block_clear(&vf->vb); - vorbis_dsp_clear(&vf->vd); - ogg_stream_clear(&vf->os); - - if(vf->vi && vf->links){ - int i; - for(i=0;i<vf->links;i++){ - vorbis_info_clear(vf->vi+i); - vorbis_comment_clear(vf->vc+i); - } - _ogg_free(vf->vi); - _ogg_free(vf->vc); - } - if(vf->dataoffsets)_ogg_free(vf->dataoffsets); - if(vf->pcmlengths)_ogg_free(vf->pcmlengths); - if(vf->serialnos)_ogg_free(vf->serialnos); - if(vf->offsets)_ogg_free(vf->offsets); - ogg_sync_clear(&vf->oy); - if(vf->datasource && vf->callbacks.close_func) - (vf->callbacks.close_func)(vf->datasource); - memset(vf,0,sizeof(*vf)); - } -#ifdef DEBUG_LEAKS - _VDBG_dump(); -#endif - return(0); -} - -/* inspects the OggVorbis file and finds/documents all the logical - bitstreams contained in it. Tries to be tolerant of logical - bitstream sections that are truncated/woogie. - - return: -1) error - 0) OK -*/ - -int ov_open_callbacks(void *f,OggVorbis_File *vf, - const char *initial,long ibytes,ov_callbacks callbacks){ - int ret=_ov_open1(f,vf,initial,ibytes,callbacks); - if(ret)return ret; - return _ov_open2(vf); -} - -int ov_open(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes){ - ov_callbacks callbacks = { - (size_t (*)(void *, size_t, size_t, void *)) fread, - (int (*)(void *, ogg_int64_t, int)) _fseek64_wrap, - (int (*)(void *)) fclose, - (long (*)(void *)) ftell - }; - - return ov_open_callbacks((void *)f, vf, initial, ibytes, callbacks); -} - -int ov_fopen(const char *path,OggVorbis_File *vf){ - int ret; - FILE *f = fopen(path,"rb"); - if(!f) return -1; - - ret = ov_open(f,vf,NULL,0); - if(ret) fclose(f); - return ret; -} - - -/* cheap hack for game usage where downsampling is desirable; there's - no need for SRC as we can just do it cheaply in libvorbis. */ - -int ov_halfrate(OggVorbis_File *vf,int flag){ - int i; - if(vf->vi==NULL)return OV_EINVAL; - if(vf->ready_state>STREAMSET){ - /* clear out stream state; dumping the decode machine is needed to - reinit the MDCT lookups. */ - vorbis_dsp_clear(&vf->vd); - vorbis_block_clear(&vf->vb); - vf->ready_state=STREAMSET; - if(vf->pcm_offset>=0){ - ogg_int64_t pos=vf->pcm_offset; - vf->pcm_offset=-1; /* make sure the pos is dumped if unseekable */ - ov_pcm_seek(vf,pos); - } - } - - for(i=0;i<vf->links;i++){ - if(vorbis_synthesis_halfrate(vf->vi+i,flag)){ - if(flag) ov_halfrate(vf,0); - return OV_EINVAL; - } - } - return 0; -} - -int ov_halfrate_p(OggVorbis_File *vf){ - if(vf->vi==NULL)return OV_EINVAL; - return vorbis_synthesis_halfrate_p(vf->vi); -} - -/* Only partially open the vorbis file; test for Vorbisness, and load - the headers for the first chain. Do not seek (although test for - seekability). Use ov_test_open to finish opening the file, else - ov_clear to close/free it. Same return codes as open. - - Note that vorbisfile does _not_ take ownership of the file if the - call fails; the calling applicaiton is responsible for closing the file - if this call returns an error. */ - -int ov_test_callbacks(void *f,OggVorbis_File *vf, - const char *initial,long ibytes,ov_callbacks callbacks) -{ - return _ov_open1(f,vf,initial,ibytes,callbacks); -} - -int ov_test(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes){ - ov_callbacks callbacks = { - (size_t (*)(void *, size_t, size_t, void *)) fread, - (int (*)(void *, ogg_int64_t, int)) _fseek64_wrap, - (int (*)(void *)) fclose, - (long (*)(void *)) ftell - }; - - return ov_test_callbacks((void *)f, vf, initial, ibytes, callbacks); -} - -int ov_test_open(OggVorbis_File *vf){ - if(vf->ready_state!=PARTOPEN)return(OV_EINVAL); - return _ov_open2(vf); -} - -/* How many logical bitstreams in this physical bitstream? */ -long ov_streams(OggVorbis_File *vf){ - return vf->links; -} - -/* Is the FILE * associated with vf seekable? */ -long ov_seekable(OggVorbis_File *vf){ - return vf->seekable; -} - -/* returns the bitrate for a given logical bitstream or the entire - physical bitstream. If the file is open for random access, it will - find the *actual* average bitrate. If the file is streaming, it - returns the nominal bitrate (if set) else the average of the - upper/lower bounds (if set) else -1 (unset). - - If you want the actual bitrate field settings, get them from the - vorbis_info structs */ - -long ov_bitrate(OggVorbis_File *vf,int i){ - if(vf->ready_state<OPENED)return(OV_EINVAL); - if(i>=vf->links)return(OV_EINVAL); - if(!vf->seekable && i!=0)return(ov_bitrate(vf,0)); - if(i<0){ - ogg_int64_t bits=0; - int i; - float br; - for(i=0;i<vf->links;i++) - bits+=(vf->offsets[i+1]-vf->dataoffsets[i])*8; - /* This once read: return(rint(bits/ov_time_total(vf,-1))); - * gcc 3.x on x86 miscompiled this at optimisation level 2 and above, - * so this is slightly transformed to make it work. - */ - br = bits/ov_time_total(vf,-1); - return(rint(br)); - }else{ - if(vf->seekable){ - /* return the actual bitrate */ - return(rint((vf->offsets[i+1]-vf->dataoffsets[i])*8/ov_time_total(vf,i))); - }else{ - /* return nominal if set */ - if(vf->vi[i].bitrate_nominal>0){ - return vf->vi[i].bitrate_nominal; - }else{ - if(vf->vi[i].bitrate_upper>0){ - if(vf->vi[i].bitrate_lower>0){ - return (vf->vi[i].bitrate_upper+vf->vi[i].bitrate_lower)/2; - }else{ - return vf->vi[i].bitrate_upper; - } - } - return(OV_FALSE); - } - } - } -} - -/* returns the actual bitrate since last call. returns -1 if no - additional data to offer since last call (or at beginning of stream), - EINVAL if stream is only partially open -*/ -long ov_bitrate_instant(OggVorbis_File *vf){ - int link=(vf->seekable?vf->current_link:0); - long ret; - if(vf->ready_state<OPENED)return(OV_EINVAL); - if(vf->samptrack==0)return(OV_FALSE); - ret=vf->bittrack/vf->samptrack*vf->vi[link].rate+.5; - vf->bittrack=0.f; - vf->samptrack=0.f; - return(ret); -} - -/* Guess */ -long ov_serialnumber(OggVorbis_File *vf,int i){ - if(i>=vf->links)return(ov_serialnumber(vf,vf->links-1)); - if(!vf->seekable && i>=0)return(ov_serialnumber(vf,-1)); - if(i<0){ - return(vf->current_serialno); - }else{ - return(vf->serialnos[i]); - } -} - -/* returns: total raw (compressed) length of content if i==-1 - raw (compressed) length of that logical bitstream for i==0 to n - OV_EINVAL if the stream is not seekable (we can't know the length) - or if stream is only partially open -*/ -ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i){ - if(vf->ready_state<OPENED)return(OV_EINVAL); - if(!vf->seekable || i>=vf->links)return(OV_EINVAL); - if(i<0){ - ogg_int64_t acc=0; - int i; - for(i=0;i<vf->links;i++) - acc+=ov_raw_total(vf,i); - return(acc); - }else{ - return(vf->offsets[i+1]-vf->offsets[i]); - } -} - -/* returns: total PCM length (samples) of content if i==-1 PCM length - (samples) of that logical bitstream for i==0 to n - OV_EINVAL if the stream is not seekable (we can't know the - length) or only partially open -*/ -ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i){ - if(vf->ready_state<OPENED)return(OV_EINVAL); - if(!vf->seekable || i>=vf->links)return(OV_EINVAL); - if(i<0){ - ogg_int64_t acc=0; - int i; - for(i=0;i<vf->links;i++) - acc+=ov_pcm_total(vf,i); - return(acc); - }else{ - return(vf->pcmlengths[i*2+1]); - } -} - -/* returns: total seconds of content if i==-1 - seconds in that logical bitstream for i==0 to n - OV_EINVAL if the stream is not seekable (we can't know the - length) or only partially open -*/ -double ov_time_total(OggVorbis_File *vf,int i){ - if(vf->ready_state<OPENED)return(OV_EINVAL); - if(!vf->seekable || i>=vf->links)return(OV_EINVAL); - if(i<0){ - double acc=0; - int i; - for(i=0;i<vf->links;i++) - acc+=ov_time_total(vf,i); - return(acc); - }else{ - return((double)(vf->pcmlengths[i*2+1])/vf->vi[i].rate); - } -} - -/* seek to an offset relative to the *compressed* data. This also - scans packets to update the PCM cursor. It will cross a logical - bitstream boundary, but only if it can't get any packets out of the - tail of the bitstream we seek to (so no surprises). - - returns zero on success, nonzero on failure */ - -int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos){ - ogg_stream_state work_os; - int ret; - - if(vf->ready_state<OPENED)return(OV_EINVAL); - if(!vf->seekable) - return(OV_ENOSEEK); /* don't dump machine if we can't seek */ - - if(pos<0 || pos>vf->end)return(OV_EINVAL); - - /* is the seek position outside our current link [if any]? */ - if(vf->ready_state>=STREAMSET){ - if(pos<vf->offsets[vf->current_link] || pos>=vf->offsets[vf->current_link+1]) - _decode_clear(vf); /* clear out stream state */ - } - - /* don't yet clear out decoding machine (if it's initialized), in - the case we're in the same link. Restart the decode lapping, and - let _fetch_and_process_packet deal with a potential bitstream - boundary */ - vf->pcm_offset=-1; - ogg_stream_reset_serialno(&vf->os, - vf->current_serialno); /* must set serialno */ - vorbis_synthesis_restart(&vf->vd); - - ret=_seek_helper(vf,pos); - if(ret)goto seek_error; - - /* we need to make sure the pcm_offset is set, but we don't want to - advance the raw cursor past good packets just to get to the first - with a granulepos. That's not equivalent behavior to beginning - decoding as immediately after the seek position as possible. - - So, a hack. We use two stream states; a local scratch state and - the shared vf->os stream state. We use the local state to - scan, and the shared state as a buffer for later decode. - - Unfortuantely, on the last page we still advance to last packet - because the granulepos on the last page is not necessarily on a - packet boundary, and we need to make sure the granpos is - correct. - */ - - { - ogg_page og; - ogg_packet op; - int lastblock=0; - int accblock=0; - int thisblock=0; - int lastflag=0; - int firstflag=0; - ogg_int64_t pagepos=-1; - - ogg_stream_init(&work_os,vf->current_serialno); /* get the memory ready */ - ogg_stream_reset(&work_os); /* eliminate the spurious OV_HOLE - return from not necessarily - starting from the beginning */ - - while(1){ - if(vf->ready_state>=STREAMSET){ - /* snarf/scan a packet if we can */ - int result=ogg_stream_packetout(&work_os,&op); - - if(result>0){ - - if(vf->vi[vf->current_link].codec_setup){ - thisblock=vorbis_packet_blocksize(vf->vi+vf->current_link,&op); - if(thisblock<0){ - ogg_stream_packetout(&vf->os,NULL); - thisblock=0; - }else{ - - /* We can't get a guaranteed correct pcm position out of the - last page in a stream because it might have a 'short' - granpos, which can only be detected in the presence of a - preceding page. However, if the last page is also the first - page, the granpos rules of a first page take precedence. Not - only that, but for first==last, the EOS page must be treated - as if its a normal first page for the stream to open/play. */ - if(lastflag && !firstflag) - ogg_stream_packetout(&vf->os,NULL); - else - if(lastblock)accblock+=(lastblock+thisblock)>>2; - } - - if(op.granulepos!=-1){ - int i,link=vf->current_link; - ogg_int64_t granulepos=op.granulepos-vf->pcmlengths[link*2]; - if(granulepos<0)granulepos=0; - - for(i=0;i<link;i++) - granulepos+=vf->pcmlengths[i*2+1]; - vf->pcm_offset=granulepos-accblock; - if(vf->pcm_offset<0)vf->pcm_offset=0; - break; - } - lastblock=thisblock; - continue; - }else - ogg_stream_packetout(&vf->os,NULL); - } - } - - if(!lastblock){ - pagepos=_get_next_page(vf,&og,-1); - if(pagepos<0){ - vf->pcm_offset=ov_pcm_total(vf,-1); - break; - } - }else{ - /* huh? Bogus stream with packets but no granulepos */ - vf->pcm_offset=-1; - break; - } - - /* has our decoding just traversed a bitstream boundary? */ - if(vf->ready_state>=STREAMSET){ - if(vf->current_serialno!=ogg_page_serialno(&og)){ - - /* two possibilities: - 1) our decoding just traversed a bitstream boundary - 2) another stream is multiplexed into this logical section? */ - - if(ogg_page_bos(&og)){ - /* we traversed */ - _decode_clear(vf); /* clear out stream state */ - ogg_stream_clear(&work_os); - } /* else, do nothing; next loop will scoop another page */ - } - } - - if(vf->ready_state<STREAMSET){ - int link; - long serialno = ogg_page_serialno(&og); - - for(link=0;link<vf->links;link++) - if(vf->serialnos[link]==serialno)break; - - if(link==vf->links) continue; /* not the desired Vorbis - bitstream section; keep - trying */ - vf->current_link=link; - vf->current_serialno=serialno; - ogg_stream_reset_serialno(&vf->os,serialno); - ogg_stream_reset_serialno(&work_os,serialno); - vf->ready_state=STREAMSET; - firstflag=(pagepos<=vf->dataoffsets[link]); - } - - ogg_stream_pagein(&vf->os,&og); - ogg_stream_pagein(&work_os,&og); - lastflag=ogg_page_eos(&og); - - } - } - - ogg_stream_clear(&work_os); - vf->bittrack=0.f; - vf->samptrack=0.f; - return(0); - - seek_error: - /* dump the machine so we're in a known state */ - vf->pcm_offset=-1; - ogg_stream_clear(&work_os); - _decode_clear(vf); - return OV_EBADLINK; -} - -/* Page granularity seek (faster than sample granularity because we - don't do the last bit of decode to find a specific sample). - - Seek to the last [granule marked] page preceding the specified pos - location, such that decoding past the returned point will quickly - arrive at the requested position. */ -int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos){ - int link=-1; - ogg_int64_t result=0; - ogg_int64_t total=ov_pcm_total(vf,-1); - - if(vf->ready_state<OPENED)return(OV_EINVAL); - if(!vf->seekable)return(OV_ENOSEEK); - - if(pos<0 || pos>total)return(OV_EINVAL); - - /* which bitstream section does this pcm offset occur in? */ - for(link=vf->links-1;link>=0;link--){ - total-=vf->pcmlengths[link*2+1]; - if(pos>=total)break; - } - - /* Search within the logical bitstream for the page with the highest - pcm_pos preceding pos. If we're looking for a position on the - first page, bisection will halt without finding our position as - it's before the first explicit granulepos fencepost. That case is - handled separately below. - - There is a danger here; missing pages or incorrect frame number - information in the bitstream could make our task impossible. - Account for that (it would be an error condition) */ - - /* new search algorithm originally by HB (Nicholas Vinen) */ - - { - ogg_int64_t end=vf->offsets[link+1]; - ogg_int64_t begin=vf->dataoffsets[link]; - ogg_int64_t begintime = vf->pcmlengths[link*2]; - ogg_int64_t endtime = vf->pcmlengths[link*2+1]+begintime; - ogg_int64_t target=pos-total+begintime; - ogg_int64_t best=-1; - int got_page=0; - - ogg_page og; - - /* if we have only one page, there will be no bisection. Grab the page here */ - if(begin==end){ - result=_seek_helper(vf,begin); - if(result) goto seek_error; - - result=_get_next_page(vf,&og,1); - if(result<0) goto seek_error; - - got_page=1; - } - - /* bisection loop */ - while(begin<end){ - ogg_int64_t bisect; - - if(end-begin<CHUNKSIZE){ - bisect=begin; - }else{ - /* take a (pretty decent) guess. */ - bisect=begin + - (ogg_int64_t)((double)(target-begintime)*(end-begin)/(endtime-begintime)) - - CHUNKSIZE; - if(bisect<begin+CHUNKSIZE) - bisect=begin; - } - - result=_seek_helper(vf,bisect); - if(result) goto seek_error; - - /* read loop within the bisection loop */ - while(begin<end){ - result=_get_next_page(vf,&og,end-vf->offset); - if(result==OV_EREAD) goto seek_error; - if(result<0){ - /* there is no next page! */ - if(bisect<=begin+1) - /* No bisection left to perform. We've either found the - best candidate already or failed. Exit loop. */ - end=begin; - else{ - /* We tried to load a fraction of the last page; back up a - bit and try to get the whole last page */ - if(bisect==0) goto seek_error; - bisect-=CHUNKSIZE; - - /* don't repeat/loop on a read we've already performed */ - if(bisect<=begin)bisect=begin+1; - - /* seek and cntinue bisection */ - result=_seek_helper(vf,bisect); - if(result) goto seek_error; - } - }else{ - ogg_int64_t granulepos; - got_page=1; - - /* got a page. analyze it */ - /* only consider pages from primary vorbis stream */ - if(ogg_page_serialno(&og)!=vf->serialnos[link]) - continue; - - /* only consider pages with the granulepos set */ - granulepos=ogg_page_granulepos(&og); - if(granulepos==-1)continue; - - if(granulepos<target){ - /* this page is a successful candidate! Set state */ - - best=result; /* raw offset of packet with granulepos */ - begin=vf->offset; /* raw offset of next page */ - begintime=granulepos; - - /* if we're before our target but within a short distance, - don't bisect; read forward */ - if(target-begintime>44100)break; - - bisect=begin; /* *not* begin + 1 as above */ - }else{ - - /* This is one of our pages, but the granpos is - post-target; it is not a bisection return - candidate. (The only way we'd use it is if it's the - first page in the stream; we handle that case later - outside the bisection) */ - if(bisect<=begin+1){ - /* No bisection left to perform. We've either found the - best candidate already or failed. Exit loop. */ - end=begin; - }else{ - if(end==vf->offset){ - /* bisection read to the end; use the known page - boundary (result) to update bisection, back up a - little bit, and try again */ - end=result; - bisect-=CHUNKSIZE; - if(bisect<=begin)bisect=begin+1; - result=_seek_helper(vf,bisect); - if(result) goto seek_error; - }else{ - /* Normal bisection */ - end=bisect; - endtime=granulepos; - break; - } - } - } - } - } - } - - /* Out of bisection: did it 'fail?' */ - if(best == -1){ - - /* Check the 'looking for data in first page' special case; - bisection would 'fail' because our search target was before the - first PCM granule position fencepost. */ - - if(got_page && - begin == vf->dataoffsets[link] && - ogg_page_serialno(&og)==vf->serialnos[link]){ - - /* Yes, this is the beginning-of-stream case. We already have - our page, right at the beginning of PCM data. Set state - and return. */ - - vf->pcm_offset=total; - - if(link!=vf->current_link){ - /* Different link; dump entire decode machine */ - _decode_clear(vf); - - vf->current_link=link; - vf->current_serialno=vf->serialnos[link]; - vf->ready_state=STREAMSET; - - }else{ - vorbis_synthesis_restart(&vf->vd); - } - - ogg_stream_reset_serialno(&vf->os,vf->current_serialno); - ogg_stream_pagein(&vf->os,&og); - - }else - goto seek_error; - - }else{ - - /* Bisection found our page. seek to it, update pcm offset. Easier case than - raw_seek, don't keep packets preceding granulepos. */ - - ogg_page og; - ogg_packet op; - - /* seek */ - result=_seek_helper(vf,best); - vf->pcm_offset=-1; - if(result) goto seek_error; - result=_get_next_page(vf,&og,-1); - if(result<0) goto seek_error; - - if(link!=vf->current_link){ - /* Different link; dump entire decode machine */ - _decode_clear(vf); - - vf->current_link=link; - vf->current_serialno=vf->serialnos[link]; - vf->ready_state=STREAMSET; - - }else{ - vorbis_synthesis_restart(&vf->vd); - } - - ogg_stream_reset_serialno(&vf->os,vf->current_serialno); - ogg_stream_pagein(&vf->os,&og); - - /* pull out all but last packet; the one with granulepos */ - while(1){ - result=ogg_stream_packetpeek(&vf->os,&op); - if(result==0){ - /* No packet returned; we exited the bisection with 'best' - pointing to a page with a granule position, so the packet - finishing this page ('best') originated on a preceding - page. Keep fetching previous pages until we get one with - a granulepos or without the 'continued' flag set. Then - just use raw_seek for simplicity. */ - /* Do not rewind past the beginning of link data; if we do, - it's either a bug or a broken stream */ - result=best; - while(result>vf->dataoffsets[link]){ - result=_get_prev_page(vf,result,&og); - if(result<0) goto seek_error; - if(ogg_page_serialno(&og)==vf->current_serialno && - (ogg_page_granulepos(&og)>-1 || - !ogg_page_continued(&og))){ - return ov_raw_seek(vf,result); - } - } - } - if(result<0){ - result = OV_EBADPACKET; - goto seek_error; - } - if(op.granulepos!=-1){ - vf->pcm_offset=op.granulepos-vf->pcmlengths[vf->current_link*2]; - if(vf->pcm_offset<0)vf->pcm_offset=0; - vf->pcm_offset+=total; - break; - }else - result=ogg_stream_packetout(&vf->os,NULL); - } - } - } - - /* verify result */ - if(vf->pcm_offset>pos || pos>ov_pcm_total(vf,-1)){ - result=OV_EFAULT; - goto seek_error; - } - vf->bittrack=0.f; - vf->samptrack=0.f; - return(0); - - seek_error: - /* dump machine so we're in a known state */ - vf->pcm_offset=-1; - _decode_clear(vf); - return (int)result; -} - -/* seek to a sample offset relative to the decompressed pcm stream - returns zero on success, nonzero on failure */ - -int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos){ - int thisblock,lastblock=0; - int ret=ov_pcm_seek_page(vf,pos); - if(ret<0)return(ret); - if((ret=_make_decode_ready(vf)))return ret; - - /* discard leading packets we don't need for the lapping of the - position we want; don't decode them */ - - while(1){ - ogg_packet op; - ogg_page og; - - int ret=ogg_stream_packetpeek(&vf->os,&op); - if(ret>0){ - thisblock=vorbis_packet_blocksize(vf->vi+vf->current_link,&op); - if(thisblock<0){ - ogg_stream_packetout(&vf->os,NULL); - continue; /* non audio packet */ - } - if(lastblock)vf->pcm_offset+=(lastblock+thisblock)>>2; - - if(vf->pcm_offset+((thisblock+ - vorbis_info_blocksize(vf->vi,1))>>2)>=pos)break; - - /* remove the packet from packet queue and track its granulepos */ - ogg_stream_packetout(&vf->os,NULL); - vorbis_synthesis_trackonly(&vf->vb,&op); /* set up a vb with - only tracking, no - pcm_decode */ - vorbis_synthesis_blockin(&vf->vd,&vf->vb); - - /* end of logical stream case is hard, especially with exact - length positioning. */ - - if(op.granulepos>-1){ - int i; - /* always believe the stream markers */ - vf->pcm_offset=op.granulepos-vf->pcmlengths[vf->current_link*2]; - if(vf->pcm_offset<0)vf->pcm_offset=0; - for(i=0;i<vf->current_link;i++) - vf->pcm_offset+=vf->pcmlengths[i*2+1]; - } - - lastblock=thisblock; - - }else{ - if(ret<0 && ret!=OV_HOLE)break; - - /* suck in a new page */ - if(_get_next_page(vf,&og,-1)<0)break; - if(ogg_page_bos(&og))_decode_clear(vf); - - if(vf->ready_state<STREAMSET){ - long serialno=ogg_page_serialno(&og); - int link; - - for(link=0;link<vf->links;link++) - if(vf->serialnos[link]==serialno)break; - if(link==vf->links) continue; - vf->current_link=link; - - vf->ready_state=STREAMSET; - vf->current_serialno=ogg_page_serialno(&og); - ogg_stream_reset_serialno(&vf->os,serialno); - ret=_make_decode_ready(vf); - if(ret)return ret; - lastblock=0; - } - - ogg_stream_pagein(&vf->os,&og); - } - } - - vf->bittrack=0.f; - vf->samptrack=0.f; - /* discard samples until we reach the desired position. Crossing a - logical bitstream boundary with abandon is OK. */ - { - /* note that halfrate could be set differently in each link, but - vorbisfile encoforces all links are set or unset */ - int hs=vorbis_synthesis_halfrate_p(vf->vi); - while(vf->pcm_offset<((pos>>hs)<<hs)){ - ogg_int64_t target=(pos-vf->pcm_offset)>>hs; - long samples=vorbis_synthesis_pcmout(&vf->vd,NULL); - - if(samples>target)samples=target; - vorbis_synthesis_read(&vf->vd,samples); - vf->pcm_offset+=samples<<hs; - - if(samples<target) - if(_fetch_and_process_packet(vf,NULL,1,1)<=0) - vf->pcm_offset=ov_pcm_total(vf,-1); /* eof */ - } - } - return 0; -} - -/* seek to a playback time relative to the decompressed pcm stream - returns zero on success, nonzero on failure */ -int ov_time_seek(OggVorbis_File *vf,double seconds){ - /* translate time to PCM position and call ov_pcm_seek */ - - int link=-1; - ogg_int64_t pcm_total=0; - double time_total=0.; - - if(vf->ready_state<OPENED)return(OV_EINVAL); - if(!vf->seekable)return(OV_ENOSEEK); - if(seconds<0)return(OV_EINVAL); - - /* which bitstream section does this time offset occur in? */ - for(link=0;link<vf->links;link++){ - double addsec = ov_time_total(vf,link); - if(seconds<time_total+addsec)break; - time_total+=addsec; - pcm_total+=vf->pcmlengths[link*2+1]; - } - - if(link==vf->links)return(OV_EINVAL); - - /* enough information to convert time offset to pcm offset */ - { - ogg_int64_t target=pcm_total+(seconds-time_total)*vf->vi[link].rate; - return(ov_pcm_seek(vf,target)); - } -} - -/* page-granularity version of ov_time_seek - returns zero on success, nonzero on failure */ -int ov_time_seek_page(OggVorbis_File *vf,double seconds){ - /* translate time to PCM position and call ov_pcm_seek */ - - int link=-1; - ogg_int64_t pcm_total=0; - double time_total=0.; - - if(vf->ready_state<OPENED)return(OV_EINVAL); - if(!vf->seekable)return(OV_ENOSEEK); - if(seconds<0)return(OV_EINVAL); - - /* which bitstream section does this time offset occur in? */ - for(link=0;link<vf->links;link++){ - double addsec = ov_time_total(vf,link); - if(seconds<time_total+addsec)break; - time_total+=addsec; - pcm_total+=vf->pcmlengths[link*2+1]; - } - - if(link==vf->links)return(OV_EINVAL); - - /* enough information to convert time offset to pcm offset */ - { - ogg_int64_t target=pcm_total+(seconds-time_total)*vf->vi[link].rate; - return(ov_pcm_seek_page(vf,target)); - } -} - -/* tell the current stream offset cursor. Note that seek followed by - tell will likely not give the set offset due to caching */ -ogg_int64_t ov_raw_tell(OggVorbis_File *vf){ - if(vf->ready_state<OPENED)return(OV_EINVAL); - return(vf->offset); -} - -/* return PCM offset (sample) of next PCM sample to be read */ -ogg_int64_t ov_pcm_tell(OggVorbis_File *vf){ - if(vf->ready_state<OPENED)return(OV_EINVAL); - return(vf->pcm_offset); -} - -/* return time offset (seconds) of next PCM sample to be read */ -double ov_time_tell(OggVorbis_File *vf){ - int link=0; - ogg_int64_t pcm_total=0; - double time_total=0.f; - - if(vf->ready_state<OPENED)return(OV_EINVAL); - if(vf->seekable){ - pcm_total=ov_pcm_total(vf,-1); - time_total=ov_time_total(vf,-1); - - /* which bitstream section does this time offset occur in? */ - for(link=vf->links-1;link>=0;link--){ - pcm_total-=vf->pcmlengths[link*2+1]; - time_total-=ov_time_total(vf,link); - if(vf->pcm_offset>=pcm_total)break; - } - } - - return((double)time_total+(double)(vf->pcm_offset-pcm_total)/vf->vi[link].rate); -} - -/* link: -1) return the vorbis_info struct for the bitstream section - currently being decoded - 0-n) to request information for a specific bitstream section - - In the case of a non-seekable bitstream, any call returns the - current bitstream. NULL in the case that the machine is not - initialized */ - -vorbis_info *ov_info(OggVorbis_File *vf,int link){ - if(vf->seekable){ - if(link<0) - if(vf->ready_state>=STREAMSET) - return vf->vi+vf->current_link; - else - return vf->vi; - else - if(link>=vf->links) - return NULL; - else - return vf->vi+link; - }else{ - return vf->vi; - } -} - -/* grr, strong typing, grr, no templates/inheritence, grr */ -vorbis_comment *ov_comment(OggVorbis_File *vf,int link){ - if(vf->seekable){ - if(link<0) - if(vf->ready_state>=STREAMSET) - return vf->vc+vf->current_link; - else - return vf->vc; - else - if(link>=vf->links) - return NULL; - else - return vf->vc+link; - }else{ - return vf->vc; - } -} - -static int host_is_big_endian() { - ogg_int32_t pattern = 0xfeedface; /* deadbeef */ - unsigned char *bytewise = (unsigned char *)&pattern; - if (bytewise[0] == 0xfe) return 1; - return 0; -} - -/* up to this point, everything could more or less hide the multiple - logical bitstream nature of chaining from the toplevel application - if the toplevel application didn't particularly care. However, at - the point that we actually read audio back, the multiple-section - nature must surface: Multiple bitstream sections do not necessarily - have to have the same number of channels or sampling rate. - - ov_read returns the sequential logical bitstream number currently - being decoded along with the PCM data in order that the toplevel - application can take action on channel/sample rate changes. This - number will be incremented even for streamed (non-seekable) streams - (for seekable streams, it represents the actual logical bitstream - index within the physical bitstream. Note that the accessor - functions above are aware of this dichotomy). - - ov_read_filter is exactly the same as ov_read except that it processes - the decoded audio data through a filter before packing it into the - requested format. This gives greater accuracy than applying a filter - after the audio has been converted into integral PCM. - - input values: buffer) a buffer to hold packed PCM data for return - length) the byte length requested to be placed into buffer - bigendianp) should the data be packed LSB first (0) or - MSB first (1) - word) word size for output. currently 1 (byte) or - 2 (16 bit short) - - return values: <0) error/hole in data (OV_HOLE), partial open (OV_EINVAL) - 0) EOF - n) number of bytes of PCM actually returned. The - below works on a packet-by-packet basis, so the - return length is not related to the 'length' passed - in, just guaranteed to fit. - - *section) set to the logical bitstream number */ - -long ov_read_filter(OggVorbis_File *vf,char *buffer,int length, - int bigendianp,int word,int sgned,int *bitstream, - void (*filter)(float **pcm,long channels,long samples,void *filter_param),void *filter_param){ - int i,j; - int host_endian = host_is_big_endian(); - int hs; - - float **pcm; - long samples; - - if(vf->ready_state<OPENED)return(OV_EINVAL); - - while(1){ - if(vf->ready_state==INITSET){ - samples=vorbis_synthesis_pcmout(&vf->vd,&pcm); - if(samples)break; - } - - /* suck in another packet */ - { - int ret=_fetch_and_process_packet(vf,NULL,1,1); - if(ret==OV_EOF) - return(0); - if(ret<=0) - return(ret); - } - - } - - if(samples>0){ - - /* yay! proceed to pack data into the byte buffer */ - - long channels=ov_info(vf,-1)->channels; - long bytespersample=word * channels; - vorbis_fpu_control fpu; - if(samples>length/bytespersample)samples=length/bytespersample; - - if(samples <= 0) - return OV_EINVAL; - - /* Here. */ - if(filter) - filter(pcm,channels,samples,filter_param); - - /* a tight loop to pack each size */ - { - int val; - if(word==1){ - int off=(sgned?0:128); - vorbis_fpu_setround(&fpu); - for(j=0;j<samples;j++) - for(i=0;i<channels;i++){ - val=vorbis_ftoi(pcm[i][j]*128.f); - if(val>127)val=127; - else if(val<-128)val=-128; - *buffer++=val+off; - } - vorbis_fpu_restore(fpu); - }else{ - int off=(sgned?0:32768); - - if(host_endian==bigendianp){ - if(sgned){ - - vorbis_fpu_setround(&fpu); - for(i=0;i<channels;i++) { /* It's faster in this order */ - float *src=pcm[i]; - short *dest=((short *)buffer)+i; - for(j=0;j<samples;j++) { - val=vorbis_ftoi(src[j]*32768.f); - if(val>32767)val=32767; - else if(val<-32768)val=-32768; - *dest=val; - dest+=channels; - } - } - vorbis_fpu_restore(fpu); - - }else{ - - vorbis_fpu_setround(&fpu); - for(i=0;i<channels;i++) { - float *src=pcm[i]; - short *dest=((short *)buffer)+i; - for(j=0;j<samples;j++) { - val=vorbis_ftoi(src[j]*32768.f); - if(val>32767)val=32767; - else if(val<-32768)val=-32768; - *dest=val+off; - dest+=channels; - } - } - vorbis_fpu_restore(fpu); - - } - }else if(bigendianp){ - - vorbis_fpu_setround(&fpu); - for(j=0;j<samples;j++) - for(i=0;i<channels;i++){ - val=vorbis_ftoi(pcm[i][j]*32768.f); - if(val>32767)val=32767; - else if(val<-32768)val=-32768; - val+=off; - *buffer++=(val>>8); - *buffer++=(val&0xff); - } - vorbis_fpu_restore(fpu); - - }else{ - int val; - vorbis_fpu_setround(&fpu); - for(j=0;j<samples;j++) - for(i=0;i<channels;i++){ - val=vorbis_ftoi(pcm[i][j]*32768.f); - if(val>32767)val=32767; - else if(val<-32768)val=-32768; - val+=off; - *buffer++=(val&0xff); - *buffer++=(val>>8); - } - vorbis_fpu_restore(fpu); - - } - } - } - - vorbis_synthesis_read(&vf->vd,samples); - hs=vorbis_synthesis_halfrate_p(vf->vi); - vf->pcm_offset+=(samples<<hs); - if(bitstream)*bitstream=vf->current_link; - return(samples*bytespersample); - }else{ - return(samples); - } -} - -long ov_read(OggVorbis_File *vf,char *buffer,int length, - int bigendianp,int word,int sgned,int *bitstream){ - return ov_read_filter(vf, buffer, length, bigendianp, word, sgned, bitstream, NULL, NULL); -} - -/* input values: pcm_channels) a float vector per channel of output - length) the sample length being read by the app - - return values: <0) error/hole in data (OV_HOLE), partial open (OV_EINVAL) - 0) EOF - n) number of samples of PCM actually returned. The - below works on a packet-by-packet basis, so the - return length is not related to the 'length' passed - in, just guaranteed to fit. - - *section) set to the logical bitstream number */ - - - -long ov_read_float(OggVorbis_File *vf,float ***pcm_channels,int length, - int *bitstream){ - - if(vf->ready_state<OPENED)return(OV_EINVAL); - - while(1){ - if(vf->ready_state==INITSET){ - float **pcm; - long samples=vorbis_synthesis_pcmout(&vf->vd,&pcm); - if(samples){ - int hs=vorbis_synthesis_halfrate_p(vf->vi); - if(pcm_channels)*pcm_channels=pcm; - if(samples>length)samples=length; - vorbis_synthesis_read(&vf->vd,samples); - vf->pcm_offset+=samples<<hs; - if(bitstream)*bitstream=vf->current_link; - return samples; - - } - } - - /* suck in another packet */ - { - int ret=_fetch_and_process_packet(vf,NULL,1,1); - if(ret==OV_EOF)return(0); - if(ret<=0)return(ret); - } - - } -} - -extern const float *vorbis_window(vorbis_dsp_state *v,int W); - -static void _ov_splice(float **pcm,float **lappcm, - int n1, int n2, - int ch1, int ch2, - const float *w1, const float *w2){ - int i,j; - const float *w=w1; - int n=n1; - - if(n1>n2){ - n=n2; - w=w2; - } - - /* splice */ - for(j=0;j<ch1 && j<ch2;j++){ - float *s=lappcm[j]; - float *d=pcm[j]; - - for(i=0;i<n;i++){ - float wd=w[i]*w[i]; - float ws=1.-wd; - d[i]=d[i]*wd + s[i]*ws; - } - } - /* window from zero */ - for(;j<ch2;j++){ - float *d=pcm[j]; - for(i=0;i<n;i++){ - float wd=w[i]*w[i]; - d[i]=d[i]*wd; - } - } - -} - -/* make sure vf is INITSET */ -static int _ov_initset(OggVorbis_File *vf){ - while(1){ - if(vf->ready_state==INITSET)break; - /* suck in another packet */ - { - int ret=_fetch_and_process_packet(vf,NULL,1,0); - if(ret<0 && ret!=OV_HOLE)return(ret); - } - } - return 0; -} - -/* make sure vf is INITSET and that we have a primed buffer; if - we're crosslapping at a stream section boundary, this also makes - sure we're sanity checking against the right stream information */ -static int _ov_initprime(OggVorbis_File *vf){ - vorbis_dsp_state *vd=&vf->vd; - while(1){ - if(vf->ready_state==INITSET) - if(vorbis_synthesis_pcmout(vd,NULL))break; - - /* suck in another packet */ - { - int ret=_fetch_and_process_packet(vf,NULL,1,0); - if(ret<0 && ret!=OV_HOLE)return(ret); - } - } - return 0; -} - -/* grab enough data for lapping from vf; this may be in the form of - unreturned, already-decoded pcm, remaining PCM we will need to - decode, or synthetic postextrapolation from last packets. */ -static void _ov_getlap(OggVorbis_File *vf,vorbis_info *vi,vorbis_dsp_state *vd, - float **lappcm,int lapsize){ - int lapcount=0,i; - float **pcm; - - /* try first to decode the lapping data */ - while(lapcount<lapsize){ - int samples=vorbis_synthesis_pcmout(vd,&pcm); - if(samples){ - if(samples>lapsize-lapcount)samples=lapsize-lapcount; - for(i=0;i<vi->channels;i++) - memcpy(lappcm[i]+lapcount,pcm[i],sizeof(**pcm)*samples); - lapcount+=samples; - vorbis_synthesis_read(vd,samples); - }else{ - /* suck in another packet */ - int ret=_fetch_and_process_packet(vf,NULL,1,0); /* do *not* span */ - if(ret==OV_EOF)break; - } - } - if(lapcount<lapsize){ - /* failed to get lapping data from normal decode; pry it from the - postextrapolation buffering, or the second half of the MDCT - from the last packet */ - int samples=vorbis_synthesis_lapout(&vf->vd,&pcm); - if(samples==0){ - for(i=0;i<vi->channels;i++) - memset(lappcm[i]+lapcount,0,sizeof(**pcm)*lapsize-lapcount); - lapcount=lapsize; - }else{ - if(samples>lapsize-lapcount)samples=lapsize-lapcount; - for(i=0;i<vi->channels;i++) - memcpy(lappcm[i]+lapcount,pcm[i],sizeof(**pcm)*samples); - lapcount+=samples; - } - } -} - -/* this sets up crosslapping of a sample by using trailing data from - sample 1 and lapping it into the windowing buffer of sample 2 */ -int ov_crosslap(OggVorbis_File *vf1, OggVorbis_File *vf2){ - vorbis_info *vi1,*vi2; - float **lappcm; - float **pcm; - const float *w1,*w2; - int n1,n2,i,ret,hs1,hs2; - - if(vf1==vf2)return(0); /* degenerate case */ - if(vf1->ready_state<OPENED)return(OV_EINVAL); - if(vf2->ready_state<OPENED)return(OV_EINVAL); - - /* the relevant overlap buffers must be pre-checked and pre-primed - before looking at settings in the event that priming would cross - a bitstream boundary. So, do it now */ - - ret=_ov_initset(vf1); - if(ret)return(ret); - ret=_ov_initprime(vf2); - if(ret)return(ret); - - vi1=ov_info(vf1,-1); - vi2=ov_info(vf2,-1); - hs1=ov_halfrate_p(vf1); - hs2=ov_halfrate_p(vf2); - - lappcm=alloca(sizeof(*lappcm)*vi1->channels); - n1=vorbis_info_blocksize(vi1,0)>>(1+hs1); - n2=vorbis_info_blocksize(vi2,0)>>(1+hs2); - w1=vorbis_window(&vf1->vd,0); - w2=vorbis_window(&vf2->vd,0); - - for(i=0;i<vi1->channels;i++) - lappcm[i]=alloca(sizeof(**lappcm)*n1); - - _ov_getlap(vf1,vi1,&vf1->vd,lappcm,n1); - - /* have a lapping buffer from vf1; now to splice it into the lapping - buffer of vf2 */ - /* consolidate and expose the buffer. */ - vorbis_synthesis_lapout(&vf2->vd,&pcm); - -#if 0 - _analysis_output_always("pcmL",0,pcm[0],n1*2,0,0,0); - _analysis_output_always("pcmR",0,pcm[1],n1*2,0,0,0); -#endif - - /* splice */ - _ov_splice(pcm,lappcm,n1,n2,vi1->channels,vi2->channels,w1,w2); - - /* done */ - return(0); -} - -static int _ov_64_seek_lap(OggVorbis_File *vf,ogg_int64_t pos, - int (*localseek)(OggVorbis_File *,ogg_int64_t)){ - vorbis_info *vi; - float **lappcm; - float **pcm; - const float *w1,*w2; - int n1,n2,ch1,ch2,hs; - int i,ret; - - if(vf->ready_state<OPENED)return(OV_EINVAL); - ret=_ov_initset(vf); - if(ret)return(ret); - vi=ov_info(vf,-1); - hs=ov_halfrate_p(vf); - - ch1=vi->channels; - n1=vorbis_info_blocksize(vi,0)>>(1+hs); - w1=vorbis_window(&vf->vd,0); /* window arrays from libvorbis are - persistent; even if the decode state - from this link gets dumped, this - window array continues to exist */ - - lappcm=alloca(sizeof(*lappcm)*ch1); - for(i=0;i<ch1;i++) - lappcm[i]=alloca(sizeof(**lappcm)*n1); - _ov_getlap(vf,vi,&vf->vd,lappcm,n1); - - /* have lapping data; seek and prime the buffer */ - ret=localseek(vf,pos); - if(ret)return ret; - ret=_ov_initprime(vf); - if(ret)return(ret); - - /* Guard against cross-link changes; they're perfectly legal */ - vi=ov_info(vf,-1); - ch2=vi->channels; - n2=vorbis_info_blocksize(vi,0)>>(1+hs); - w2=vorbis_window(&vf->vd,0); - - /* consolidate and expose the buffer. */ - vorbis_synthesis_lapout(&vf->vd,&pcm); - - /* splice */ - _ov_splice(pcm,lappcm,n1,n2,ch1,ch2,w1,w2); - - /* done */ - return(0); -} - -int ov_raw_seek_lap(OggVorbis_File *vf,ogg_int64_t pos){ - return _ov_64_seek_lap(vf,pos,ov_raw_seek); -} - -int ov_pcm_seek_lap(OggVorbis_File *vf,ogg_int64_t pos){ - return _ov_64_seek_lap(vf,pos,ov_pcm_seek); -} - -int ov_pcm_seek_page_lap(OggVorbis_File *vf,ogg_int64_t pos){ - return _ov_64_seek_lap(vf,pos,ov_pcm_seek_page); -} - -static int _ov_d_seek_lap(OggVorbis_File *vf,double pos, - int (*localseek)(OggVorbis_File *,double)){ - vorbis_info *vi; - float **lappcm; - float **pcm; - const float *w1,*w2; - int n1,n2,ch1,ch2,hs; - int i,ret; - - if(vf->ready_state<OPENED)return(OV_EINVAL); - ret=_ov_initset(vf); - if(ret)return(ret); - vi=ov_info(vf,-1); - hs=ov_halfrate_p(vf); - - ch1=vi->channels; - n1=vorbis_info_blocksize(vi,0)>>(1+hs); - w1=vorbis_window(&vf->vd,0); /* window arrays from libvorbis are - persistent; even if the decode state - from this link gets dumped, this - window array continues to exist */ - - lappcm=alloca(sizeof(*lappcm)*ch1); - for(i=0;i<ch1;i++) - lappcm[i]=alloca(sizeof(**lappcm)*n1); - _ov_getlap(vf,vi,&vf->vd,lappcm,n1); - - /* have lapping data; seek and prime the buffer */ - ret=localseek(vf,pos); - if(ret)return ret; - ret=_ov_initprime(vf); - if(ret)return(ret); - - /* Guard against cross-link changes; they're perfectly legal */ - vi=ov_info(vf,-1); - ch2=vi->channels; - n2=vorbis_info_blocksize(vi,0)>>(1+hs); - w2=vorbis_window(&vf->vd,0); - - /* consolidate and expose the buffer. */ - vorbis_synthesis_lapout(&vf->vd,&pcm); - - /* splice */ - _ov_splice(pcm,lappcm,n1,n2,ch1,ch2,w1,w2); - - /* done */ - return(0); -} - -int ov_time_seek_lap(OggVorbis_File *vf,double pos){ - return _ov_d_seek_lap(vf,pos,ov_time_seek); -} - -int ov_time_seek_page_lap(OggVorbis_File *vf,double pos){ - return _ov_d_seek_lap(vf,pos,ov_time_seek_page); -} |